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A City banker who had a witch’s hat left on her desk by male colleagues has won her claim for sex discrimination.

Stacey Macken sued the French bank BNP Paribas for £4million after being belittled by her boss who kept telling her “not now, Stacey”.

The £120,000-a-year worker also claimed that over a four-year period she received hundreds of thousands of pounds less than her male peers in salary and bonuses.

A tribunal heard that one of her bosses, Matt Pinnock, often answered the phone with the words “hi, fu**face” and “hi, sexy” and once discussed how a friend and his wife had engaged in “prostitution” role play.

The BNP Paribas HQ in the City of London

Another boss, Denis Pihan, was accused of routinely demeaning her by replying “not now, Stacey” when she tried to talk to him.

And around Halloween 2013 a witch’s hat was left on her desk after a group of workers, including Mr Pinnock, had gone on a drinking session.

His former assistant, Georgina Chapman, told a tribunal in London: “They were visibly drunk. I arrived at work the next morning and there was a witch’s hat on Stacey’s desk.”

The tribunal ruled in her favour relating to claims of unequal pay, sex discrimination and victimisation.

Her claims of harassment were dismissed. The size of her award has yet to be determined.